我国时速350公里最长高铁隧道贯通

Core Viewpoint - The successful completion of the Yiliang Tunnel, a critical project for the Yukun High-Speed Railway, marks a significant achievement in China's high-speed rail construction under complex geological conditions, laying a solid foundation for the entire line's operation [1][3]. Group 1: Project Details - The Yiliang Tunnel, located in Zhaotong City, Yunnan Province, spans 24.8 kilometers with a design speed of 350 kilometers per hour and a maximum depth of 920 meters, making it the longest and fastest high-speed rail tunnel in China [3]. - The tunnel traverses the Umon Mountain area, known for its complex geological structures, including rock bursts, high ground temperature, water inflow, and soft rock deformation, presenting significant construction challenges [3][5]. Group 2: Construction Techniques - The construction team implemented various measures to address high ground stress rock bursts, including stress release, fiber-reinforced concrete spraying, and increased prestressed anchor rods to ensure safety and progress [5]. - To tackle high-temperature environments and drainage issues, an intelligent temperature control system was developed, maintaining working conditions around 30°C, and a multi-level drainage system was established with a daily capacity of 345,000 cubic meters [5]. Group 3: Technological Innovations - A research team led by experts was formed to address the unique challenges of the Umon Mountain range, resulting in a proprietary technology system with three provincial-level construction methods and seven national patents, along with one international patent application [5]. Group 4: Economic Impact - The Yukun High-Speed Railway, approximately 700 kilometers long with a 388.6-kilometer segment in Yunnan, will reduce travel time between Chongqing and Kunming to about two and a half hours, significantly enhancing connectivity and promoting high-quality economic development in the Chengdu-Chongqing economic circle and the central Yunnan urban agglomeration [6].